Running through the centre of the property is Groff Mill Creek. The creek is nearly four kilometres in length from start to finish (upstream north of Dumfries Conservation Area and downstream to the Grand River); averages five to thirty centimetres deep, and 1.2 metres wide. Groff Mill Creek, which begins just north of Sheldon Drive, passes through the property, and eventually empties into the Grand River, has one tributary. The tributary, flows from the east across Highway 24 into the property, and into the eastern pond. The tributary meets the main creek just within the property near the corner of the Ciccura property.
Groff Mill Creek, named after Andrew Groff who tapped the spring creek in about 1835, was straightened in 1983. The creek, running through the property from east to west, was proposed to be straightened to enhance drainage from the Parkview Heights subdivision north of Dunbar Road and west of Hespeler Road. Although the Hilborn family did not agree with this decision, as it would be inconsistent with their father’s intentions. Backhoes soon moved in, digging out the creek and straightening it. The creek was lined along its bottom and side with geotextile fabric and an interlocking open-work concrete block system.
There are two small ponds on the property. Both ponds were created by Mr. Hilborn sometime in the late 1950s. One of the ponds, mentioned above, is located on the eastern section of the property, adjacent to Hespeler Road. The other pond is located in the western half of the property.